Even though the Battle City tournament is over, you still have to ante a card if you want to win a card, and they did something extremely annoying: You can't ante or sell a card you have only one copy of in your trunk, and that's not counting if a card is in your deck, either
Some cards offer a decent rarity bump for necessary components to a more modern deck
Its not a huge deal if you are happy to pay for the item, honestly us Europeans have been paying import fees from everywhere outside of EU for many years
These cards do a mechanic called gusting, which essentially means directly switching an opponents Active Pokemon with a Benched Pokemon
While Charizard ex is a popular deck that uses Fire-type energy, it is actually a Dark-type because of the Tera gimmick
Collect them all with the Mega Heroes Mini Tin Display